Is Data Valid Time (tDV) of 12nS for AD9959 correct? Or should it be 1.2nS instead?

Q

Data Valid Time (tDV) is indicated as 12ns minimum (refer to Table 25 On page 31 of the AD9959 RevB data-sheet. This can't be true with respect to the fast 5ns serial-data clock? Should it be 1.2ns instead?

A

12nS is correct. This timing is for a read operation (Figure 42). Read operations were not designed for speed like the write operation. 12ns is what the designers targeted as the minimum.